Improvement in the manufacture of glass buttons



I. 85' G. LEHMANN.-

MANUFACTURE OF GLASS BUTTONS. No.171,394. Patented 1m. 21, 1875.

Wizzewes MPEI'ERS, FHDTO LITHOGRAFHER ASHINGTON, D C.

Y-NITE STATES PATENT firrron.

ISAAC LEHMA NN AND GOUDOHAUX LEHMANN, OF NEW YORK, N. Y.

IMPROVEMENT IN THE MANUFACTURE OF GLASS BUTTONS.

Specification forming part of Letters Patent No. 171,394, dated December 21, 1875 application filed December '7, 1875.

To all whom it may concern:

Be it known that we, ISAAC LEHMANN and GOUDCHAUX LEHMANN, both of the city, county, and State of New York, have jointly invented a new and useful Improvement in the Manufacture of Glass Buttons; and we do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, which forms part of this specification.

Glass buttons which are made in dies or molds have heretofore been very imperfectlyconstructed, by reason of the difficulty which has been experienced in proportioning the amount of the plastic glass introduced within the one mold to insure the close fit of the other mold or die within the first one, and in default of which. a ragged or protruding edge has been formed around the button, that it has been necessary afterward to grind off, in order to give a proper finish to the button. This after-work has involved much labor and expense, and even then the button has not been as perfect in its finish as is desirable.

This invention consists in an improvement in manufacturing glass buttons, whereby they are formed with a band or collar produced by aspecial construction of the molds or dies,

and which serves to take up any surplus glass that may be placed in the one mold irrespective of the depth of entry of the other mold, so far as a perfect finish of the button is concerned, and so that there is no sharp ragged edge to be afterward ground off or dressed, thus greatly economizing, as well as beautifying the construction of the button.

Figure 1 represents a side view of a glass button constructed in accordance with our invention 5 and Figs. 2, 3, sectional elevations, in planes at right angles to each other, of a pair of dies or molds, as in the act of forming the improved button. Fig. 4 is a sec tional view of a glass button as produced under the old method, before grinding off the raggededge left by the dies; and Fig. 5,a ver- 1 tical section of the dies as in the act of forming such a button.

To explain our invention, reference will first be made to Figs. 4 and 5 of the drawing. A is a glass button, as heretofore produced B, of which is the receiving die or mold for the lumpof plastic glass, and the upper diing die, through which the metal shank b is inserted, and which divided upper die is tawithin the lower die, and by a suitable appliquired.

formed, which has afterward to be removed by grinding.

This defect we obv iate by our manufacture of the button. Thus, referring to Figs. 1, 2, and 3 of the drawing, A is the improved button, formed with a band or collar, d, around it, and having the usual metal shank b. To form said button the lower die B has an annular enlargement, 6, made in and lar enlargement forms a cylindrical chamber to receive snugly within it the face end of the its entry, such cylindrical chamber or annular enlargement, when force is applied to the die, the extent of entry being dependent die, so that the annular enlargement 6 alby means of dies B and (l G, the lower one,

vided die or mold G O the follower or presspered off on its face edges to readily enter cation of pressure to form the button. as. re-

This construction of the dies invariably pressed into the lower die a ragged edge, 0, is

around its mouth end or face. This annudivided or pressing die 0 Othat is, said upper die partially enters in a close -fitting manner within, irrespective of the depth of upon the amount of plastic glass in the lower ways forms a receiving-space for the surplus glass, and the button, as it comes from the mold, is left with a perfect band or collar, 61, which requires no grinding-off, but gives a tinish and improved appearance to the button.

We claim As an improvement in the manufacture of glass buttons, the formation of the button with a band or collar, (1, produced by constructing the die in which the plastic glass is placed with a cylindrical receiving space or cnlargement,e, in its mouth, forthe surplus glass under pressure, substantially as shown and described.

ISAAC LEHMANN. GOUDOHAUX LEHMANN.

Witnesses:

BENJAMIN W. HOFFMAN. FRED. HAYNES. 

